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The answer to the ninth grade mathematics in Dapeiyou
The first question is that you list the remainder after dividing the first few numbers by 3, and you will find that the arrangement of the remainder is as follows:

0,2,2, 1,0, 1, 1,2,0,2,2, 1,0, 1, 1,2

That is to say, every eight numbers will be repeated, and three of every eight numbers have the remainder 1.

1995 divided by 8=249 remainder 3

The remainder 3 indicates that there are still three digits. According to the following rules, it is found that the remainder of the first three digits in each group is not 1.

So 1 divided by 3 is 249*3=747.

The same method can be used to calculate the law that every 16 numbers will be repeated.

2005/ 16= 125 remainder 5

The remainder of the 2005th bit can be calculated as 6 as the remainder of the 5th bit.

In a word, the key to this topic is to find the law.